The Shocktube® is a high-impact, waterproof, vented tube, made from top quality, bonded 100% CR Neoprene™ which is double lined with stretch nylon on both sides. Completely enclosing the motorcycle's rear shock absorber and spring, Shocktube® prevents damage from road salt, water spray, stone chipping, dust and dirt. The Shocktube® can be fitted to most motorcycles with either monoshock or twin shock systems quickly, without the need to remove the shock absorber! It continually protects the rear shock absorber and spring, while still maintaining the condition of the shock for a substantially extended period of time, throughout the life of the motorcycle. Can't find the right Shocktube® to fit your bike? Simply measure your own! Measuring Instructions: Using a ridged or flexible tape measure, mark down the spring length in mm from the top edge of the pre-load adjuster ring, to the bottom edge of the lowest part of the spring. Then..... using a flexible tape measure, mark down the circumference in mm of the spring around its thickest part at the top or bottom of the spring. Simply contact us by phone or email and we should be able to provide you with the correct fitting Shocktube®. See additional pictures in gallery for assistance.